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E. WESTON. APPARATUS FOR PRODUGING VAGUUMS.

No. 283,549. Patented Aug. 21V, 1883.

N. PEKERS. Woman-zwar. walngwn. uA c.

Unirse l STATES EDVARD XVESTON, AOF NEVARK, NEW' JERSEY, ASSIGOR TO THE UNITED STATES ELECTRIC LIGHTING'COMPIANY, OF NEWT YORK, N. Y.

APPARATUS Fou PRODUGING VACUUMS.

SPECIFIGATION forming part of Letters Patent No. 283,549, dated August 21, 1883.

- application inea May s. ieee. (No man.)

To all. whom it may concern:

Beit known that I, EDWARD Wnsrou, a subject of the Queen of Great Britain, and a resident of Newark, in the county of Essex andSt-ate 5 of New Jersey, have invented certain new and for containing anhydrous or absorptive substances.

In the accompanying drawings, Figure l is a view in elevation of a pump embodying my improvements. Fig. 2 is an enlarged sectional view ofthe chamber for containing the mercury and the drop-tube; Fig. 3, a sectional view of the exhaust-chamber and passages communieating therewith, and Fiff. et a view partly in section of the part for containing the absorptive substances.

Similar letters of reference indicate corresponding parts in all the figures.

The apparatus is to be, mounted on van upright support, A, the several parts being held in the usual way by metal clamps and bands.

- The chamber from which the mercury is supplied to the drop-tube is designated by l), and consists of an open globe extended at the bott om in atube, B. The lower interiorportion of tube B is conical, and is ground to form a seat for a valve, the stem G of which extends up through chamber D. This valve Amay be formed, as shown, by a conical plug, of glass or steel, with a channel or du ct, o, which registers with a duct in the tube B 5 or, instead of the registeringducts, the stem may be combined with proper supports, and constructed so that it may be raised from its seat, whether by means of a screwthread or otherwise.

Below the valve, in a continuation of tube B, is the nozzle d, which discharges the mercury from chamber l) through the enlarged bore of tube B to the contracted drop-tube e. This latter is extended to a proper length, and bent upward and joined to a globe, F, at a point near the bottom.

A barometer-tube, j', of very small bore, to prevent the introduction of air-bubbles into the pump, is joined to the globe F at a point slightly above the opening ofthe drop-tube c,

and dips in a vessel, l?, 'provided with an overflow.

From the upper part of globe F leads a tube, 71 communicating` with an air-pump capable of rapidly exhausting-such, for insta-nce, as may be run by steam or water power.

From the tube L, at a point von a line with or above the nozzle d, leads the tube E, with which may be connected the spark-tube N, the cup G, containing an absorptive substancesuch as phosphoric anhyd ri lle-and thelamps to be exhausted.

An apparatusd thus constructed is operated as follows: flhe vessel l. and globe l) are illed with mercury, valve-duct c closed, and a lamp, L, connected to the tube E. By means ofthe steam-pump (not shown in the drawings) the interior of the apparatus is exhausted of air as far as can be practically done. Connnunication with the steam-pump may then be shut oil" by a valve in tube h. The valve c is then opened, and the mercury from globe D descends through the nozzle d Iinto the drop-tube c, carrying with it the air in tubes B and E until a high degree of exhaustion is reached. The mercury, passing through tubeE, which, for the best vresults should, in practi ce, be of slightly greater length relatively to the other parts than appears'by the drawings, enters the globe F, where a comparatively high vacuumcxists.

To provi de g globe, and the consequent necessity ofshutting I off the pump for vits withdrawal, the barometer-tubcf is used.

ae'ainst the mercury iilling the The entrance oi' this tube 9 TOO and its appurtenances, it will be seen that a parts of the pump completely.

-taining an absorptive substance.

In Fig. 4 is shown an arrangement for con- It consists l of a globe or ask, G, which is fitted by a ground joint over a nozzle, K. To the neck of globe G is joined a short tube, M, to which the lamps to be exhausted are to be united. \Vithin the nozzle K is formed a tube, L, that extends down vbelow the nozzle, ending in a flaring mouth. It is joined to the side of the nozzle, as shown. rIube M enters the neck of globe G at a point which will cause it to register with the tube L. By this means the globe is made to serve .as a cock for disconnecting the lamp-tube or any part of the apparatus with which it may be used. The purpose of the aring tube L is to prevent the absorptive powder used in globe G from being driven into the pumpan accidentlikely to occur in many forms of pump when in the process of sealing off the exhausted lamps, or in other ways, air is suddenly admitted to the pump through the lamp-tube M.

Having now described my invention,wl1at I claim as new, and desire to secure by Letters Patent, is*

l. In a vacuum apparatus of the kind dcervoir, a tube connected therewith, and a coniv cal valve-seat lwithin said tube, of a valve resting in said seat, and a stein therefor extending into or through the mercury-reservoir, substantially as above set forth.

3. In a vacuum apparatus, the combination of a. drop-tube, a globe with which the said tube connects, a barometer-tube communicating with the globe slightly above the entrance of the drop-tube, and an exhaust-tube leading from the upper vportion of the globe, as set forth.

4. The combination, with a vacuum apparatus, of a globe or flask for containing absorptive substances, thc said flask being connected to the apparatus by a ground joint, and constructed to operate as a cock for closing coininunication between two parts of the apparatus, as set forth.

5. rlhe combination, in avacnum apparatus, of a nozzle, as K, a tube, as L, having a iiaring mouth, and contained within the same, a flask for containing absorptive substances, iitted over said nozzle by a ground joint, and a tube,

M, joined to the neck ofthe flask and arranged 7 5 to register with the tube'L, as and for the purpose set forth. y

In testimony whereof I have hereunto set my hand this 3d day of July, 1882.

EDWARD wnsToN. "Witnesses:

HENRY A, BECKMEYER, J oHN F. KELLY. 

